NOAA's National Centers for Environmental Information (NCEI) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated bathymetric-topographic DEMs are used to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources including: NOAA; the U.S. Geological Survey (USGS); and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to the vertical datum of NAVD 88 and horizontal datum of World Geodetic System 1984 geographic (WGS 84). Grid spacing for the DEM is 1/3 arc-second (~10 meters).

Developed for the National Tsunami Hazard Mitigation Program in support of NOAA's tsunami forecasting and warning efforts.

Use Limitations

Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.

Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.

Originators

DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce

Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.

Fees

Fee information not available.

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Processing Steps

2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.

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Processor

DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce

Processing Steps

2015-07-16T00:00:00 - All datasets obtained by NCEI were converted to common horizontal and vertical datums of WGS 84 geographic and NAVD 88, respectively, using VDatum. They were also converted to common file format for visualization and inspection.

2015-07-28T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.

2015-08-17T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1/3 arc-second grid that interpolated to fill empty cells. Points extracted every 5 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting Arc ASCII grid was imported into ArcGIS and clipped to the coastline to remove values over land.

2015-08-23T00:00:00 - xyz files for each input dataset were gridded using MB-System's 'mbgrid' tool, which utilizes a high-tension spline interpolation method to fill grid cells with no input elevation values. Preferential weighting was given to more recent, higher-accuracy datasets.

2015-08-24T00:00:00 - The DEM was quantitatively evaluated by comparing with source datasets.

NOAA OCM Digital Coast(download)This centralized, user-friendly, and cost-effective information repository was developed by the NOAA's Office for Coastal Management for the coastal managers, planners, decision-makers, and technical users who are charged to manage the nation???s coastal and ocean resources to sustain vibrant coastal communities and economies.

NOAA OCM Digital Coast(download)This centralized, user-friendly, and cost-effective information repository was developed by the NOAA's Office for Coastal Management for the coastal managers, planners, decision-makers, and technical users who are charged to manage the nation???s coastal and ocean resources to sustain vibrant coastal communities and economies.

NOAA OCM Digital Coast(download)This centralized, user-friendly, and cost-effective information repository was developed by the NOAA's Office for Coastal Management for the coastal managers, planners, decision-makers, and technical users who are charged to manage the nation???s coastal and ocean resources to sustain vibrant coastal communities and economies.

Description of Source: Source Contribution: Topographic Lidar LAS

Temporal extent used: 2010-01-22 to 2010-01-28

2011 U.S. Geological Survey (USGS) Alabama Topographic LiDAR: Baldwin County East and West (NAVD88)

NOAA OCM Digital Coast(download)This centralized, user-friendly, and cost-effective information repository was developed by the NOAA's Office for Coastal Management for the coastal managers, planners, decision-makers, and technical users who are charged to manage the nation???s coastal and ocean resources to sustain vibrant coastal communities and economies.